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#1 2006-03-22 20:34:54

EAD
Member
Registered: 2006-03-11
Posts: 255

Nvidia and fast writes

Hii, it seem then when running the sysinfo tool, the Fast writes on my nvidia is disable.
when running
cat /proc/driver/nvidia/agp/card
and
cat /proc/driver/nvidia/agp/host-bridge
it does say that my card support this mode, I have tried adding to my Xorg.conf the line under section "device"
Option         "AGPFastWrite" "true"
and still nada, Can some one please help me out here?
:?:

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#2 2006-03-22 22:04:37

Neuro
Member
From: Poland
Registered: 2005-10-12
Posts: 352

Re: Nvidia and fast writes

Try adding this to your /etc/modprobe.conf

alias char-major-195* nvidia
options nvidia NVreg_EnableAGPSBA=1 NVreg_EnableAGPFW=1

Works for me:

[neuro@wintermute:~] cat /proc/driver/nvidia/agp/status
Status:          Enabled
Driver:          AGPGART
AGP Rate:        8x
Fast Writes:     Enabled
SBA:             Enabled

Edit: Oh, and this requires reinserting the module. So either reboot or

init 3
modprobe -r nvidia
init 5

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#3 2006-03-23 07:05:04

EAD
Member
Registered: 2006-03-11
Posts: 255

Re: Nvidia and fast writes

Tanx!!!
Works great, why isn't it the deafult?

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#4 2006-03-23 07:24:17

Neuro
Member
From: Poland
Registered: 2005-10-12
Posts: 352

Re: Nvidia and fast writes

EAD wrote:

Tanx!!!
Works great, why isn't it the deafult?

Because it's hardware-specific. Take a look here:

cat /proc/driver/nvidia/agp/host-bridge
Host Bridge:     PCI device 1106:3189
Fast Writes:     Supported
SBA:             Supported
AGP Rates:       8x 4x
Registers:       0x1f000a1b:0x00000b12

Not everyone has these pretty supported flags on wink

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#5 2006-03-23 07:25:42

Cam
Member
From: Brisbane, Aus
Registered: 2004-12-21
Posts: 658
Website

Re: Nvidia and fast writes

Because not everyone has an nvidia card...

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#6 2006-03-23 07:49:08

EAD
Member
Registered: 2006-03-11
Posts: 255

Re: Nvidia and fast writes

Yes I know not everyone have these, but every one with Nvidia new card has it:)
Any way, How did you know it? (adding these lines to modprobe)
Where can I read about it?
:?:

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#7 2006-03-23 08:02:17

rpgcyco
Member
From: Australia
Registered: 2005-09-27
Posts: 73
Website

Re: Nvidia and fast writes

I remember reading quite a few times on nvnews.net that having Fast Writes enabled can potentially cause instability.

- Rpg Cyco

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#8 2006-03-23 08:27:09

Neuro
Member
From: Poland
Registered: 2005-10-12
Posts: 352

Re: Nvidia and fast writes

EAD wrote:

Yes I know not everyone have these, but every one with Nvidia new card has it:)
Any way, How did you know it? (adding these lines to modprobe)
Where can I read about it?
:?:

I've done it waay-back on my previous Slackware installation. modinfo nvidia gave me a hint how to do it. Now, there are guides for it:
http://doc.gwos.org/index.php/Nvidia_Dr … Addressing

rpgcyco wrote:

I remember reading quite a few times on nvnews.net that having Fast Writes enabled can potentially cause instability.

It all depends on your specific hardware. I've never had problems with it.

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#9 2006-03-23 14:27:23

EAD
Member
Registered: 2006-03-11
Posts: 255

Re: Nvidia and fast writes

Tanx guys!
I love getting more info, great pages and woo, I am stupid, it is all written in "modinfo nvidia"
Tanx again big_smile

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#10 2006-03-23 16:13:49

jaboua
Member
Registered: 2005-11-05
Posts: 634

Re: Nvidia and fast writes

EAD wrote:

Yes I know not everyone have these, but every one with Nvidia new card has it:)

Nope, I got an nvidia geforce 2 mx - it supports SBA, but not fastwrites.

Got to try SBA though, never tried it before.

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#11 2006-03-23 18:21:53

Cotton
Member
From: Cornwall, UK
Registered: 2004-09-17
Posts: 548

Re: Nvidia and fast writes

EAD, how much of a difference did this make?

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#12 2006-03-23 22:06:48

EAD
Member
Registered: 2006-03-11
Posts: 255

Re: Nvidia and fast writes

amm, it gives me some more FPS on some OpenGL.
beside, why not using a good thing if I can?
smile

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